CN107706546B - Multi-band antenna with parasitic coupling feed - Google Patents
Multi-band antenna with parasitic coupling feed Download PDFInfo
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- CN107706546B CN107706546B CN201710854742.4A CN201710854742A CN107706546B CN 107706546 B CN107706546 B CN 107706546B CN 201710854742 A CN201710854742 A CN 201710854742A CN 107706546 B CN107706546 B CN 107706546B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q23/00—Antennas with active circuits or circuit elements integrated within them or attached to them
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/36—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith
- H01Q1/38—Structural form of radiating elements, e.g. cone, spiral, umbrella; Particular materials used therewith formed by a conductive layer on an insulating support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/48—Earthing means; Earth screens; Counterpoises
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q1/00—Details of, or arrangements associated with, antennas
- H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/10—Resonant antennas
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/30—Arrangements for providing operation on different wavebands
- H01Q5/307—Individual or coupled radiating elements, each element being fed in an unspecified way
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01Q—ANTENNAS, i.e. RADIO AERIALS
- H01Q5/00—Arrangements for simultaneous operation of antennas on two or more different wavebands, e.g. dual-band or multi-band arrangements
- H01Q5/50—Feeding or matching arrangements for broad-band or multi-band operation
Abstract
The invention provides a multi-band antenna with parasitic coupling feed, which adopts coupling capacitance feed to feed three arrays respectively so as to form a multi-band antenna or a broadband antenna; the antenna mainly comprises a rectangular dielectric substrate, a microstrip feeder line, a capacitive coupling feed structure, a symmetrical parasitic array, a brush-shaped resonant array and a partial ground plane printed below the rectangular dielectric substrate; the gap between the capacitor feed structure and the array is adjusted to achieve better impedance matching, so that the designed antenna meets the requirements of multiple frequency bands and wide frequency bands; the multi-band antenna with the parasitic coupling feed has a lower section and a smaller size, can be flexibly designed according to the requirement of a working frequency band, can be installed in mobile handheld equipment, and realizes high-quality communication.
Description
Technical Field
The present invention relates to an antenna, and more particularly, to a multi-band antenna with parasitic coupling feeding.
Background
With the rapid development of communication technology, mobile communication services have entered thousands of households, which bring great changes to people's lives, especially wireless personal voice and digital services, which have greatly changed people's lives. Accordingly, there is an increasing demand for mobile communication devices, and existing mobile terminals integrate various functions. To meet the functional requirements of the characteristics, an antenna is usually required as a conversion device for transmitting and receiving energy. However, the existing communication equipment integrates a plurality of communication systems, and a plurality of antennas are required to be integrated in the equipment, so that the volume of the equipment is increased, the cost of the equipment is increased, and the electromagnetic compatibility design of the system is not facilitated. In recent years, wireless communication terminals with small size, low profile, wide frequency band, multiple functions, and low cost are favored by people and the market, and therefore, the design of antennas faces many challenges. In recent years, the research of multiband antennas has become one of the hot problems in academia and industry, and scholars and engineers at home and abroad design various planar broadband antennas and multiband antennas, mainly adopting microstrip feeding, aperture coupling feeding, coplanar waveguide feeding and coaxial feeding. Most of these antennas are implemented in a multi-layer structure or a grooved manner. The antenna excited by such a feed structure generally has good electrical characteristics, but the multilayer structure thereof increases the manufacturing cost and the loss of surface waves, and the structure is relatively complex and is not easy to debug in practical engineering. In addition, in the mobile communication device used at present, a larger bandwidth is often needed, and sometimes a plurality of resonant frequency bands are also needed, the design can meet the communication requirements of a plurality of protocols, the manufacturing cost of the device is lower, the design of the antenna is convenient to integrate with the system, and the electromagnetic compatibility design of the system is facilitated. Therefore, the impedance bandwidth can be widened by improving the feeding structure and adopting a plurality of resonator designs, and high-performance multiband and broadband antennas can be designed by generating a plurality of frequency bands.
Marco Simone et al proposed a microstrip line coupled slot fed multiband antenna in 2014, and can be applied to wireless lan communication, and the antenna can obtain larger radiation power. However, the antenna adopts a double-layer structure, has a large volume, and is not beneficial to engineering debugging and system integration design. In addition, Andrea Michel et al designed a novel broadband microstrip antenna in 2016, printed multiple monopole antennas on the same compact dielectric substrate, and fed by using a microstrip line, but the size of the microstrip antenna is large, and the microstrip antenna cannot be flexibly designed according to requirements.
Disclosure of Invention
The invention aims to provide a multi-band antenna with parasitic coupling feed, which adopts a capacitive coupling feed structure to feed three arrays respectively, and adopts capacitive coupling feed, thereby being beneficial to widening the impedance bandwidth of the antenna, realizing frequency adjustment according to actual requirements and meeting the requirement of flexible design of working frequency bands.
The purpose of the invention is realized as follows: be provided with the microstrip feeder on a terminal surface of rectangular medium base plate, the capacitive coupling feed structure, the resonance array, two symmetry parasitic arrays, the microstrip feeder passes through the capacitive coupling feed structure with signal coupling to the resonance array, on two symmetry parasitic arrays, two symmetry parasitic arrays set up along the central line mirror symmetry of rectangular medium base plate, the microstrip feeder, the capacitive coupling feed structure, the resonance array is located between two symmetry parasitic arrays, the microstrip feeder, the capacitive coupling feed structure is located resonance array top, another terminal surface of rectangular medium base plate sets up partial ground plane.
The invention also includes such structural features:
1. the resonant array is in a brush-shaped structure with tooth shapes of different lengths, and the two symmetrical parasitic arrays are in an R-shaped structure and an anti-R-shaped structure respectively.
2. The resonant array is of an E-shaped structure, the tooth end of the E-shaped structure of the harmonic array is arranged downwards, and the two symmetrical parasitic arrays are of an L-shaped structure and an inverse L-shaped structure respectively.
3. The capacitively coupled feed structure is an L-shaped structure.
4. The capacitive coupling feed structure is an annular structure and is positioned between the microstrip feed line and the resonant oscillator.
Compared with the prior art, the invention has the beneficial effects that: according to the invention, the signal is coupled to the three arrays by adopting the micro-strip feeder line through the capacitive coupling feed structure, and better impedance matching can be realized by adjusting the size of a gap between the capacitive coupling feed structure and the arrays, so that the requirements of multiple frequency bands and wide frequency bands are met. The feed structure can also adopt discrete elements such as a resistor, an inductor or a capacitor to adjust on the feed structure, thereby realizing wider bandwidth and facilitating the integrated design with the microwave front end.
Compared with most of existing broadband antennas, the antenna is designed to be of a multilayer structure or a radiating element parasitic structure due to the commonly adopted aperture coupling feed structure, the size and the dimension of the antenna are large, and the manufacturing cost is relatively high. The invention adopts a capacitive coupling feed structure, adopts a single-layer plane design, realizes a bandwidth design through the capacitive coupling structure, can realize a multi-band design according to requirements, and has the advantages of low profile, small size and low cost.
Drawings
Fig. 1 is a top view of an antenna according to a first embodiment of the present invention;
fig. 2 is a side view of an antenna according to a first embodiment of the present invention;
fig. 3 is a top view of an antenna according to a second embodiment of the present invention;
fig. 4 is a top view of an antenna according to a third embodiment of the present invention;
fig. 5 is a top view of an antenna according to a fourth embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
The invention designs a multi-band antenna with parasitic coupling feed, wherein the designed antenna transfers energy to a parasitic coupling capacitor structure through a microstrip feed line, and then the parasitic coupling capacitor structure transfers electromagnetic energy to an R-shaped symmetrical array and a brush-shaped resonant array in a coupling manner. The microstrip feed line 102 of the designed antenna feeds the three arrays through the capacitive coupling feed structure 103, that is, a microstrip feed and capacitive coupling feed conversion structure is adopted, that is, the microstrip feed is converted into the capacitive coupling feed structure, and the three arrays are fed. The microstrip feed line 102 is connected to the inner conductor of the SMA, the outer conductor of the SMA is connected to a partial ground plane at the bottom of the dielectric substrate.
The invention is described in further detail below with reference to the accompanying drawings:
the first embodiment is as follows: the designed antenna is shown in fig. 1 and fig. 2, and the antenna mainly comprises a rectangular dielectric substrate 101, a microstrip feeder line 102, a capacitive coupling feed structure 103, symmetrical parasitic arrays 104 and 105 which are respectively of an inverse R-shaped structure and an R-shaped structure, a brush-shaped resonant array 106 and a partial ground plane 107 printed below the rectangular dielectric substrate 101; by adjusting the gap between the capacitive feed structure 103 and the array, the resonant frequency and bandwidth of the antenna can be effectively adjusted. The opposite array parasitic arrays 104 and 105 are in mirror symmetry with the center line of the dielectric substrate, and the brush-shaped resonant array 106 adopts a tooth-shaped structure with unequal lengths. The microstrip feed line 102 is connected with the inner conductor of the SMA connector, the SMA outer conductor is connected with part of the ground plane 107, and the microstrip feed line transfers energy to the three arrays through the capacitive coupling structure. The microstrip feed line 102 feeds the three arrays through the capacitive coupling feed structure 103, and the slot between the capacitive coupling feed structure 103 and the array is adjusted to achieve better impedance matching, so that the designed antenna can meet the requirements of multiple frequency bands and wide frequency bands. Three arrays of the designed antenna respectively adopt a brush-shaped resonant array 106 and symmetrical parasitic arrays 104 and 105, and a microstrip feeder line 102 feeds the three arrays through a capacitive coupling feeding structure 103; symmetrical parasitic arrays 104 and 105 of the antenna form a symmetrical R-shaped structure, and a brush-shaped resonant array 106 is coupled with the feed microstrip line 102 and the symmetrical parasitic arrays 104 and 105 to form broadband resonance. The main radiator of the designed antenna adopts brush-shaped resonant arrays with different lengths, and simultaneously, a pair of R-shaped symmetrical parasitic arrays with opposite directions are introduced to be used as secondary radiating elements, so that a bandwidth antenna or a multiband antenna can be conveniently and independently designed.
The second embodiment: embodiment 2 of the present invention is as shown in fig. 3, an antenna designed by this embodiment mainly includes a rectangular dielectric substrate 201, a microstrip feed line 202, a capacitive coupling feed structure 203, symmetrical parasitic arrays 204 and 205 which are respectively of an inverted L-shaped structure and an L-shaped structure, an E-shaped resonant array 206, and a partial ground plane printed under the rectangular dielectric substrate 201; by adjusting the gap between the capacitive feed structure 203 and the array, the resonant frequency and bandwidth of the antenna can be effectively adjusted. The opposite array parasitic arrays 204 and 205 are mirror-symmetrical to the central line of the dielectric substrate, and the resonant frequency band and the resonant bandwidth can be adjusted by adjusting the length and the width of the L-shaped array. The E-shaped resonant array 206 adopts an E-shaped structure, which is beneficial to widening the bandwidth of the antenna. The resonant frequency of antenna can be according to 1/4 wavelength resonance calculation L shape array's length, and the size of E shape resonance array can be obtained according to the experience, through the resonant length of adjusting each array, makes the antenna that designs satisfy required operating frequency and bandwidth.
The third embodiment is as follows: embodiment 3 of the present invention is as shown in fig. 4, in this embodiment, an L-shaped capacitive coupling feed is adopted on the basis of embodiment 2, and the designed antenna mainly includes a rectangular dielectric substrate 301, a microstrip feed line 302, an L-shaped capacitive coupling feed structure 303, symmetrical parasitic arrays 304 and 305 respectively having an inverted L-shaped structure and an L-shaped structure, an E-shaped resonant array 306, and a part of ground plane printed under the rectangular dielectric substrate 301; the microstrip feed line 302 and the L-shaped capacitive coupling feed structure 303 form a coupling feed structure, and the strength of the coupling feed can be realized by adjusting the length and the width of the L-shaped capacitive coupling feed structure 303. In addition, the coupling gaps between the L-shaped capacitive coupling feed structure 303, the symmetric parasitic arrays 304 and 305, and the E-shaped resonant array 306 can be adjusted, so as to adjust the coupling strength and achieve stable impedance matching.
The fourth embodiment is as follows: as shown in fig. 5, the present embodiment adopts a loop coupling feed structure on the basis of embodiments 2 and 3, and the designed antenna mainly includes a rectangular dielectric substrate 401, a microstrip feed line 402, a loop capacitive coupling feed structure 403, symmetrical parasitic arrays 404 and 405 respectively having an inverted L-shaped structure and an L-shaped structure, an E-shaped resonant array 406, and a partial ground plane printed under the rectangular dielectric substrate 401; the microstrip feed line 402 adopts an L-shaped feed structure, and forms a coupled feed structure with the annular capacitive coupled feed structure 403, and the strength of the coupled feed can be realized by adjusting the coupling gap and the coupling length between the L-shaped horizontal side of the microstrip feed line 402 and the annular capacitive coupled feed structure 403. In addition, the coupling gaps between the annular capacitive coupling feed structure 403 and the symmetric parasitic arrays 404 and 405 and the E-shaped resonant array 406 can be adjusted, so that the coupling strength is adjusted, and stable impedance matching is achieved.
The parasitic coupling array adopted by the invention can also adopt a bending structure, an F-shaped structure, a T-shaped structure and the like, can reduce the size of the antenna and is convenient for integrated design with an actual system. The capacitance coupling feed structure can adjust the capacitance by adjusting the distance between the feed structure and the array, so that the designed antenna can meet strong coupling feed or weak coupling feed, and the required antenna is designed according to actual requirements. The invention relates to a multi-band antenna with parasitic coupling feed, wherein a micro-strip feed line feeds through a capacitive coupling structure, and a gap between the coupling capacitive structure and an array is adjusted to obtain good impedance matching so as to meet the requirements of multi-band or broadband.
In summary, the present invention discloses a multi-band antenna with parasitic coupling feeding, which adopts coupling capacitor feeding to feed three arrays respectively, thereby forming a multi-band antenna or a broadband antenna; the antenna mainly comprises a rectangular dielectric substrate, a microstrip feeder line, a capacitive coupling feed structure, a symmetrical parasitic array, a brush-shaped resonant array and a partial ground plane printed below the rectangular dielectric substrate; the gap between the capacitor feed structure and the array is adjusted to achieve better impedance matching, so that the designed antenna meets the requirements of multiple frequency bands and wide frequency bands; the multi-band antenna with the parasitic coupling feed has a lower section and a smaller size, can be flexibly designed according to the requirement of a working frequency band, can be installed in mobile handheld equipment, and realizes high-quality communication.
Claims (2)
1. A parasitically coupled fed multi-band antenna, characterized by: the end face of one face of the rectangular dielectric substrate is provided with a micro-strip feeder line, a capacitive coupling feed structure, a resonant array and two symmetrical parasitic arrays, the micro-strip feeder line couples signals to the resonant array and the two symmetrical parasitic arrays through the capacitive coupling feed structure, the two symmetrical parasitic arrays are arranged in a mirror symmetry mode along the central line of the rectangular dielectric substrate, the micro-strip feeder line, the capacitive coupling feed structure and the resonant array are located between the two symmetrical parasitic arrays, the micro-strip feeder line and the capacitive coupling feed structure are located above the resonant array, and the end face of the other face of the rectangular dielectric substrate is provided with a part of ground plane; forming a multi-frequency antenna by the combination of the feed structure and the radiation unit; the resonant array is in a brush-shaped structure with tooth shapes of different lengths, and the two symmetrical parasitic arrays are in an R-shaped structure and an anti-R-shaped structure respectively.
2. A parasitically coupled-fed multiband antenna according to claim 1, characterized in that: the capacitively coupled feed structure is an L-shaped structure.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710854742.4A CN107706546B (en) | 2017-09-20 | 2017-09-20 | Multi-band antenna with parasitic coupling feed |
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| CN201710854742.4A CN107706546B (en) | 2017-09-20 | 2017-09-20 | Multi-band antenna with parasitic coupling feed |
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| CN107706546A CN107706546A (en) | 2018-02-16 |
| CN107706546B true CN107706546B (en) | 2021-02-12 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108777355A (en) * | 2018-04-17 | 2018-11-09 | 哈尔滨工程大学 | A kind of low section broad-band antenna |
| CN108832271A (en) * | 2018-05-25 | 2018-11-16 | 哈尔滨工程大学 | A kind of symmetrical Multi-Function Antenna |
| CN109066078B (en) * | 2018-08-08 | 2020-03-27 | 南京信息职业技术学院 | Multi-frequency-band back cavity type butterfly antenna used on metal platform |
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| CN102005645A (en) * | 2010-12-02 | 2011-04-06 | 哈尔滨工程大学 | Miniaturized dual-frequency antenna |
| CN103779654A (en) * | 2014-01-14 | 2014-05-07 | 西安电子科技大学 | Double-frequency broadband bowtie antenna adopting self-similarity feed technology |
| CN105140649A (en) * | 2015-07-27 | 2015-12-09 | 电子科技大学 | Multi-band antenna |
| CN204947082U (en) * | 2015-10-09 | 2016-01-06 | 李秀萍 | A kind of high-gain parasitic structure antenna |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203180062U (en) * | 2013-01-14 | 2013-09-04 | 中国计量学院 | Double-frequency microstrip antenna of circular wide-slit coupling structure |
| CN206274545U (en) * | 2016-12-30 | 2017-06-23 | 惠州硕贝德无线科技股份有限公司 | A kind of PCB antenna based on resonator |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005645A (en) * | 2010-12-02 | 2011-04-06 | 哈尔滨工程大学 | Miniaturized dual-frequency antenna |
| CN103779654A (en) * | 2014-01-14 | 2014-05-07 | 西安电子科技大学 | Double-frequency broadband bowtie antenna adopting self-similarity feed technology |
| CN105140649A (en) * | 2015-07-27 | 2015-12-09 | 电子科技大学 | Multi-band antenna |
| CN204947082U (en) * | 2015-10-09 | 2016-01-06 | 李秀萍 | A kind of high-gain parasitic structure antenna |
Non-Patent Citations (1)
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| 应用于无线局域网的多频带微带天线研究与设计;王刚;《万方学位论文数据库》;20140416;论文第17-39页 * |
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